Japanese scientists said they were able to convert stem cells derived from the amniotic sac into heart cells while doing away with the need to match donor-recipient cell typing. Experiments on rats showed that injecting the converted heart cells two weeks after a heart attack improved cardiac function by more than 34%. The report's co-author said he believes the cells may be used to treat autoimmune conditions, including systemic lupus erythematosus and rheumatoid arthritis.

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